testMigration.java

@Test
public void testMigration() throws Exception {
    // Context of the app under test.
    Context testContext = InstrumentationRegistry.getContext();
    Context context = InstrumentationRegistry.getTargetContext();
    KriptonLibrary.init(context);
    InputStream schema1 = testContext.getAssets().open("xeno_schema_1.sql");
    InputStream schema2 = testContext.getAssets().open("xeno_schema_2.sql");
    InputStream finalSchema1 = testContext.getAssets().open("xeno_schema_1.sql");
    InputStream finalSchema2 = testContext.getAssets().open("xeno_schema_2.sql");
    SQLiteTestDatabase.clearDatabase(context);
    SQLiteTestDatabase database = SQLiteTestDatabase.builder(1, schema1)
            .addPopulator(datasource -> XenoApplication.fillCountryCodes(context))
            .addVersionUpdateTask(2, (datasource, previousVersion, currentVersion) -> XenoApplication.migrationVersion2(context, datasource))
            .build();
    database.updateAndVerify(1, finalSchema1);
    database.updateAndVerify(2, finalSchema2);
}